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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 687 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST CROSSOVER PIPE REPLACEMENT (3.1 L)INSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the exhaust crossover pipe.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  2. Install the exhaust crossover pipe nuts.

    Tighten 

    Tighten the nuts to 25 N.m (18 lb ft).

    Fig 1: Installing Exhaust Crossover Pipe And Nuts
    G02080697Courtesy of GENERAL MOTORS CORP.
  3. Install the exhaust crossover heat shield.
  4. Install the exhaust crossover heat shield bolts.

    Tighten 

    Tighten the bolts to 10 N.m (89 lb in).

  5. Install the thermostat bypass pipe. Refer to THERMOSTAT BYPASS PIPES REPLACEMENT in Engine Cooling.
  6. Install the air cleaner intake duct.
    Fig 2: Installing Exhaust Crossover Heat Shield And Bolts
    G02080698Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.